changed twitter footer link from @Avalara to @avadev
changed twitter footer link from @Avalara to @avadev

bob-erdman/developer-dot,ted-spence-avalara/developer-dot,mlsnyder/developer-dot,ted-spence-avalara/developer-dot,mlsnyder/developer-dot,mlsnyder/developer-dot,bob-erdman/developer-dot,mlsnyder/developer-dot,ted-spence-avalara/developer-dot,mlsnyder/developer-dot,ted-spence-avalara/developer-dot,ted-spence-avalara/developer-dot,bob-erdman/developer-dot,bob-erdman/developer-dot,bob-erdman/developer-dot